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Over the past three months, 10million households visited Lidl, with the chain particularly popular among families with children, Kantar's research showed.

These households typically buy more items in each shop, helping the German discounter to increase its average basket of sales.

Alcohol and fresh produce sales have been particularly strong.

Fraser McKevitt, head of retail and consumer insight at Kantar Worldpanel, said: "All four of Britain’s biggest grocers managed to grow sales for the fifth consecutive period, a run of collective success not seen since 2013.

"However, this welcome period of sustained growth hasn’t been enough to entirely offset pressure from the discounters: the big four now account for just 69.3 per cent of the UK grocery market – down from 76.3 per cent five years ago – and that looks set to fall further in the coming months.”